TWO-STAGE EVAPORATING COOLER WITH RHCh

The Institute of Power Engineering and Automation of the Academy of Sciences of Republic of Uzbekistan

Advantages of evaporating cooler (conditioner)

Reduce of electrical energy consumption by 4-5 times in comparison with compression conditionersOptimizing of humidity of cooled airLack of compressor and increasing of reliabilitySimplification of design, reduce of materials consumption and manufacturing contentLow cost (at 3-4 times)Possibility to combine with alternative electrical sources (particularly, with photovoltaic or thermoelectric generators)

Physical basis

Evaporation heat of water is 2.4 MJ/kg at 40 °CSpecific heat is 1 kJ/(kg K) for air and 4.8 kJ/(kg K) for water at 40 °CThere is 54.2 g water steam in 1 m3 air at 100 % relative humidity and 40 °CThere is 8.13 g water steam in 1 m3 air at 14 % relative humidity and 40 °CDecreasing of air temperature as a result of additional water evaporationEnergy consumption for air and water supply only

Two-stage evaporative cooler with RHCh (schematic)

1 and 2 are revolving heat changers (RHCh)3 and 10 are water4 is atmospheric air5, 6 and 7 are air flows into RHCh8 is humid air into atmosphere9 is air after first RHCh11 and 12 are cooled air into room

Design of evaporative cooler having two RHCh (domestic version)

Without the enclosureDriver of RHCh and water pump are seen here

Arrows show air flows

With the enclosureFans and jalousie for out coming air of first stage are seen herePower consumption is 50 W,

cooling power is 200 W

Photos of the laboratory prototype

State of art and prospects

A patent application for a new design of the evaporative cooler of higher efficiency has prepared now. The design documentation of its version for moderate rooms (20-25 m2) is prepared to conjoint produce with private enterprise “Vershina Olimpa” (Tashkent)The design documentation of last one for moderate rooms (20-25 m2) and photovoltaic power supply will be prepared in nearest future